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  • Mastering PostGIS
  • Dominik Mikiewicz Michal Mackiewicz Tomasz Nycz
  • 117字
  • 2021-07-02 22:52:20

Importing flat data

Loading flat data may seem to be a bit dull initially but it is important to understand that many popular and interesting datasets often contain the spatial information in very different formats, such as:

  • Coordinates expressed in Lon/Lat or projected coordinates
  • Encoded geometry, for example WKT, TopoJSON, GeoJSON
  • Location in the form of an address
  • Location in non-cartesian coordinates, for example start point, angle and direction
  • While the earlier examples indicate the data would require further processing in order to extract the spatial content into a usable form, clearly ability to import flat datasets should not be underestimated
Flat data in our scenario is data with no explicitly expressed geometry - non-spatial format, text-based files
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